I think the book is great especially because it includes several trading systems. In fact, I skipped almost the entire book but its systems part. Basic ideas of the systems are those you can see somewhere else too. But what amazed me is many of them employ a 350-day moving average. 350 days is more than a year, or more like a year and 6 or 7 months on a business days basis. I wonder how the author/Turtle people come up with that. Probably the answer is somewhere I skipped. Since I just browsed the book (only the systems part) and did not test his/their ideas, I do not know how good the systems are. In addition, I feel it must be better to use some variable number adaptive to the market condition rather than 350, the fixed number. But I believe using large numbers (probably those adaptive) must be good for a system.